#!/usr/bin/env python
# -*- coding:utf-8 -*-

# value = 'alex SB'
# new_value = value.lower()
# print(value,new_value)

"""
while True:
    num = input("请选择服务：")

    flag = num.isdigit()
    print(flag)
    if flag:
        num = int(num)
    else:
        print('请输入数字')
"""

"""
user = input('请输入用户名：')
new_user1 = user.lstrip()
new_user2 = user.rstrip()
print(new_user1)
print(new_user2)
"""

"""
message = '我去你大爷家玩大爷大爷'
new_message = message.replace('大爷','**',1)
print(new_message)
"""

# message = '123123,121231l,1231'
# result = message.split(',',1)
# print(result)

"""
total = 0
text = input('please input something:')
index_len = len(text)

index = 0
while True:
    val = text[index]
    flag = val.isdigit()
    if flag:
        total += 1
    if index == index_len - 1:
        break
    index += 1
print(total)
"""

v = 'oldboy'

v1 = v[2:4] # 2<=索引位置<3
print(v1)